[digikam] [Bug 338138] New: Preview uses low quality interpolation

[DrSlony-4]

https://bugs.kde.org/show_bug.cgi?id=338138

            Bug ID: 338138
           Summary: Preview uses low quality interpolation
           Product: digikam
           Version: 4.2.0
          Platform: Gentoo Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: [hidden email]
          Reporter: [hidden email]

Created attachment 88170
  --> https://bugs.kde.org/attachment.cgi?id=88170&action=edit
Screenshot showing image preview

I haven't noticed this before so it's possibly a new bug. digiKam 4.2.0 uses a
low quality interpolation algorithm resulting in horrible previews.

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[DrSlony-4]

https://bugs.kde.org/show_bug.cgi?id=338138

DrSlony <[hidden email]> changed:

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                 CC|                            |[hidden email]

--- Comment #1 from DrSlony <[hidden email]> ---
Created attachment 88171
  --> https://bugs.kde.org/attachment.cgi?id=88171&action=edit
It should look like this

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[Veaceslav Munteanu-2]

https://bugs.kde.org/show_bug.cgi?id=338138

Veaceslav Munteanu <[hidden email]> changed:

           What    |Removed                     |Added
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                 CC|                            |veaceslav.munteanu90@gmail.
                   |                            |com
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #2 from Veaceslav Munteanu <[hidden email]> ---
I think the problem is relevant to #337231

*** This bug has been marked as a duplicate of bug 337231 ***

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[DrSlony-4]

https://bugs.kde.org/show_bug.cgi?id=338138

--- Comment #3 from DrSlony <[hidden email]> ---
Are you sure?

I skimmed through that bug report. Seems to me if these bugs are related then I
would see a jagged preview even when no scaling is performed, i.e. when the
image fits inside the digiKam preview space, yet that's not the case - when no
scaling is performed the preview looks good.

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[Robert Zeller]

https://bugs.kde.org/show_bug.cgi?id=338138

Robert Zeller <[hidden email]> changed:

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                 CC|                            |robert.zeller@robert-zeller
                   |                            |.org

--- Comment #4 from Robert Zeller <[hidden email]> ---
Yes, I think both phenomena (grainy preview & artificial patterns on image
parts with regular repeating structures like e.g. brick walls) are related. I
am encountering both on DK 4.2., when preview-full-size-of-image is set to
true. This was not the case in DK 4.1

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[Veaceslav Munteanu-2]

https://bugs.kde.org/show_bug.cgi?id=338138

--- Comment #5 from Veaceslav Munteanu <[hidden email]> ---
The only modification that could affect preview is support for Macbook's retina
displays. Developer who proposed patch will wrap code for Mac OS, just wait.

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[Vincent Barberet]

https://bugs.kde.org/show_bug.cgi?id=338138

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--- Comment #6 from Vincent Barberet <[hidden email]> ---
Created attachment 88191
  --> https://bugs.kde.org/attachment.cgi?id=88191&action=edit
bad quality preview

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[Vincent Barberet]

https://bugs.kde.org/show_bug.cgi?id=338138

--- Comment #7 from Vincent Barberet <[hidden email]> ---
Comment on attachment 88191
  --> https://bugs.kde.org/attachment.cgi?id=88191
bad quality preview

Here is a zoom on the issue I'm facing. It seems similar to other attachments.
Please tell me which info is needed to troubleshoot this issue.

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=338138

Gilles Caulier <[hidden email]> changed:

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                 CC|                            |[hidden email]
          Component|general                     |Preview

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=338138

Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
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             Status|RESOLVED                    |REOPENED
         Resolution|DUPLICATE                   |---
     Ever confirmed|0                           |1

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=338138

--- Comment #8 from Gilles Caulier <[hidden email]> ---
See comment 21 from bug 337231 for the future solution :

https://bugs.kde.org/show_bug.cgi?id=337231#c21

Gilles Caulier

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=338138

--- Comment #9 from Gilles Caulier <[hidden email]> ---
Git commit 2e03ccdb9319e40b8e40cabea569c8656053171f by Gilles Caulier.
Committed on 17/08/2014 at 10:24.
Pushed by cgilles into branch 'master'.

apply new patch #88275 from Axel Arnold about Retina display support will be
only managed under OSX, not Linux or Windows.
Related: bug 337231

M  +7    -0    CMakeLists.txt
M  +3    -0    digikam/utils/config-digikam.h.cmake.in
M  +5    -0    libs/widgets/graphicsview/graphicsdimgitem.cpp
M  +5    -0    utilities/imageeditor/widgets/imagepreviewitem.cpp
M  +5    -1    utilities/slideshow/slideshow.cpp

http://commits.kde.org/digikam/2e03ccdb9319e40b8e40cabea569c8656053171f

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[DrSlony-4]

https://bugs.kde.org/show_bug.cgi?id=338138

--- Comment #10 from DrSlony <[hidden email]> ---
Great! Now when is 4.2.1 out? :)

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[Gilles Caulier-4]

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--- Comment #11 from Gilles Caulier <[hidden email]> ---
Not 4.2.1, but 4.3.0.

Look release plan :

https://www.digikam.org/about/releaseplan

Gilles Caulier

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[DrSlony-4]

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--- Comment #12 from DrSlony <[hidden email]> ---
Thank you.

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[Gilles Caulier-4]

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Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Version Fixed In|                            |4.3.0

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[Gilles Caulier-4]

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Gilles Caulier <[hidden email]> changed:

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         Resolution|---                         |FIXED
             Status|REOPENED                    |RESOLVED

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[DrSlony-4]

https://bugs.kde.org/show_bug.cgi?id=338138

--- Comment #13 from DrSlony <[hidden email]> ---
Thank you!

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